Display won't come on

Here is my dilemma, I have this pc E machines T5234 which I recently changed the motherboard with a near compatible one, which I bought online. I have the wiring and connector pins in the correct areas. The fan comes on, the led light comes on,power switch turns on pc and turns it off when when you hold it for 10 secs +. So am assuming that all is good so far. My problem is I can't see anything on the monitor, it shows absolutely nothing. I plugged it into my laptop as a another screen and it comes on, shows what is displayed on the laptop, so am assuming the monitor is good ,so why doesn't it show anything when I plug it into the desktop. I also tried the same thing with the old motherboard and same thing monitor shows nothing, could it be the monitor, and why would it work in the laptop and not the desktop.

What prompted you to get a new motherboard? If the old one was working and isn't now then you either damaged it doing the transfer or didn't reconnect it correctly. Or if it wasn't working before then don't expect it to work now.

If the old motherboard wasn't working and the new one isn't either then maybe the problem is with another piece of hardware--probably the PSU--and not the motherboard(s). The fact that fans and drives spin up and LEDs flash doesn't guarantee a good PSU.

What prompted me to get a new motherboard, the old one just stopped working everything I did and changed the desktop didn't come on, so I deduced it was the motherboard, was very surprised when I tried the old motherboard and it worked with he same result as the new one, monitor won't display anything. Also changed the power supply, just trying to figure out what other piece of hardware could possibly go bad.

Recheck all the connections. Verify the cpu and its heatsink are correctly installed. With the power cable disconnected remove all the cards and drives. Then start it up and see if you get the posting or logo screen. If it works then one of the disconnected items must be at fault.

There's so many possibilities. Sometimes a bad power supply will ruin the motherboard as well. If that happened perhaps it ruined your new one as well.

Are you sure the new power supply has sufficient power? Did the new motherboard come with a cpu or did you use the old one? If you used the old one it may be bad or not compatible with the new board.

Thanks very much for the response to my question, found the problem, PSU is faulty, don't know why they make these things this way, if's not good then it should not be sending power anywhere. Would save us some headache. Thanks again would have never guessed.

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